MHT CET Physics question

When source of sound moves towards a stationary observer, the wavelength of sound received by him [MHTCET 2018, MHTCET 2018]

(A)decreases while frequency increasesCorrect
(B)remains the same, whereas frequency increases
(C)increases and frequency also increases
(D)decreases while frequency remains the same

Answer: (A)

Solution

The moving source crowds the waves ahead of it, so the wavelength decreases, and since the speed of sound in the medium is fixed, increases; (b) and (d) are wrong

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Question ID VK-068674